Add Manage Moderator Permissions

Manage-Moderator-Permissions.md

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+The game has one built-in Admin role called `root` which has all permission, all other roles have to be configured.
+The admin role of a user is configured in the `accounts` collection by the field `admRole` of each accounts document.
+
+Following permissions can be set:
+- `play`
+- `playInMaintenance`
+- `playClosedPTR`
+- `playFreeSpace`
+- `mute`
+- `mutePermanent`
+- `ban`
+- `banPermanent`
+- `gmView`
+- `observeGames`
+- `giveFreeSpace`
+- `propertyEdit`
+- `promoControl`
+- `adminView`
+- `adminEdit`
+- `privilegesControl`
+- `roleAssignment`
+
+By default, this configuration is read from a document in the collection `admRoles` within the database `web_adm`.
+E.g. you could create the roles `moderator` and `gm` like this:
+```js
+db.admRoles.updateOne({}, { $set: {
+  "roles.moderator": { play: NumberInt(1), mute: NumberInt(1), ban: NumberInt(1), gmView: NumberInt(1) },
+  "roles.gm": { play: NumberInt(1), playInMaintenance: NumberInt(1), mute: NumberInt(1),
+                mutePermanent: NumberInt(1), ban: NumberInt(1), banPermanent: NumberInt(1),
+                gmView: NumberInt(1), observeGames: NumberInt(1), adminView: NumberInt(1) }
+}}, { upsert: true })
+```